An Electronic Absorption Spectrum of C2+:B4Σu- - X4Σg-

Article abstract of DOI:10.1021/j100310a007

The B⁴Σ_u^- - X⁴Σ_g^- electronic transition of C2⁺ in a 5 K neon matrix has been identified.The 0-0, 1-0, and 2-0 bands are observed in absorption when (12)C2⁺ and (13)C2⁺ are produced in the matrix by photolysis followed by photoionization of various precursors, the most favorable one being chloroacetylene.The carrier and symmetry of the transition are assigned on the basis of spectroscopic and chemical evidence and by comparison to recent calculations.The 1-1 band is also observed in the wavelength-dispersed fluorescence spectrum of C2⁺, subsequent to laser excitation of the 1-0 absorption transition.The derived spectroscopic constants (in neon matrix) are ν₀₀=19765(4) cm^-1, w'_e=1507(4) cm^-1, ωκ'_e=8(4) cm^-1, and ν''(1-0)=1359(6) cm^-1.